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A141428 Conjectured to be complete list of numbers not of the form x^2 + 5*y^2 + 3*triangular number. 8
2, 11, 26, 37, 40, 53, 62, 142, 220, 425, 692 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Ben Kane and Zhi-Wei Sun, On almost universal mixed sums of squares and triangular numbers, arXiv:0808.2761
MATHEMATICA
Reap[For[n = 1, n <= 700, n++, If[FindInstance[n == x^2 + 5y^2 + 3z(z+1)/2, {x, y, z}, Integers] == {}, Print[n]; Sow[n]]]][[2, 1]] (* Jean-François Alcover, Oct 01 2018 *)
CROSSREFS
Sequence in context: A241238 A296285 A077482 * A371344 A104085 A080663
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 05 2008
STATUS
approved

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Last modified April 23 18:16 EDT 2024. Contains 371916 sequences. (Running on oeis4.)